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Calculate Ash Deposition Indices

The calculations below allow you to calculate a number of ash deposition indices from a coal ash analysis. Enter the ash analysis and the coal sulphur content in the boxes on the left. Then click on the "Calculate" button.

ASH ANALYSIS
Silica	SiO2	%
Alumina	Al2O3	%
Iron	Fe2O3	%
Calcium	CaO	%
Magnesium	MgO	%
Sodium	Na2O	%
Potassium	K2O	%
Titanium	TiO2	%
Manganese	Mn3O4	%
Sulphur	SO3	%
Phosphorus	P2O5	%

Sulphur in coal	S	% db

ASH DEPOSITION - Some common indices
Index				Severity
Base/Acid ratio	B/A		__
Iron Index	Fe2O3 x B/A	%
Multi-Viscosity Index	MVI
Critical Viscosity @ 1426ºC	CV@1426ºC	poise
T250 Temperature	T250	ºC
Iron + Calcium	Fe2O3 + CaO	%
Slagging Factor	Rs	%
Fouling Factor	Rf	%
Ultra-systems' recommendations**
Values calculated here are normalised to: <5 = "Good", >10 = "Bad"
Index	Weighting Factor			Severity
Fe2O3 x B/A	1.0
MVI	0.8
CV1426ºC	0.6
Fe2O3 + CaO	0.4
B/A	0.2
OVERALL
** Refererence: Juniper LA, 1996. Ash Deposition Indices Revisited. Workshop on Impact of Coal Quality on Thermal Coal Utilisation, CRC for Black Coal Utilisation, Brisbane.

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